Guidelines:Modules: Difference between revisions
From Zelda Wiki, the Zelda encyclopedia
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, 27 April 2020
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| A list of utility modules is available at [[:Category:Utility Modules]]. Leverage utility modules as much as possible so that the wiki's codebase stays {{Wp|Don't repeat yourself|DRY}}. | | A list of utility modules is available at [[:Category:Utility Modules]]. Leverage utility modules as much as possible so that the wiki's codebase stays {{Wp|Don't repeat yourself|DRY}}. |
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| ===Higher-Order Functions===
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| In utility modules such as [[Module:UtilsTable]], you'll often see functions like these:
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| <syntaxhighlight lang="lua">
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| utilsTable.isEqual({})({})
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| > true
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| </syntaxhighlight>
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| You might've expected the usual function syntax <code>utilsTable.isEqual({}, {})</code> instead. The above is an example of a '''higher-order function'''—a function that returns a function. The function call above is shorthand for:
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| <syntaxhighlight lang="lua">
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| local isEmpty = utilsTable.isEqual({})
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| isEmpty({})
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| > true
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| </syntaxhighlight>
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| Functions are written this way for increased reusability. They are often composed with the other type of higher-order function—one that accepts a function as an argument:
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| <syntaxhighlight lang="lua">
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| local isEmpty = utilsTable.isEqual({})
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| local notEmpty = utilsFunction.negate(isEmpty)
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| local magicWords = utilsTable.filter(notEmpty)({ {}, {}, {"Kooloo"}, {"Limpah"} })
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| utilsTable.flatten(magicWords)
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| > { "Kooloo", "Limpah" }
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| </syntaxhighlight>
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| ==Exercises== | | ==Exercises== |
